My manifolds were leaking pretty bad, so I looked at getting them replaced. These headers aren't much more than the stock replacement and the stock manifolds are crap. So, it seemed like a no brainer. The installation on these are really difficult, if you have an older truck like mine. All the studs were rusted, a couple broke and the oil dipstick tube broke trying to get it out. It's not banks fault, their product is great. I don't notice a huge power gain. They look great though.